Google Voice Clapham Colossus Ad

@JCDecaux_UK tweeted about a new ad placed in the UK by Google for Google Voice.

The ad is on the Clapham Colossus, which I guess is this well known railway ad spot. I believe it was done by the JCDecaux agency.

The tweet was posted this morning noon time in Europe.

It reads, "soo pah hak la frah jah lis tik eks pee ah lee doh suh." Which I have honestly no idea what it means. I assume it should read the other way but again, if any readers can help me out? Is it German?

Update: I am dumb, this is from Mary Poppins, her Supercalifragilisticexpialidocious line. Thanks Stuart!